Network, generic

U031F Software Incompatibility With Accessory Protocol Interface Module

Check engine lightUsually off
EmissionsNot relevant
Drive cycleNot required
Limp modeNo

The accessory protocol interface module (APIM) is the SYNC computer, as Ford calls it, behind the centre screen, which handles audio sources, phone, voice control and navigation. U031F tells that a connected unit finds the APIM software unsuitable. Ford shows the underlying problem on 2018–2019 Lincoln Navigator (SSM 51464): after a 10-inch centre display was renewed, the screen could fail to power up because displays from part number JL7T-18B955-UG onward need a newer SYNC software level; the remedy is an APIM software update with FDRS. Ford does not name U031F in that bulletin. The APIM is not part of engine control, so no MIL is expected. U0253 means lost contact, U0554 invalid data. Typical signs are a dark or restarting screen and missing phone, audio or navigation.

Likely causes

Replacement display or other unit needs a newer SYNC software level than installed
APIM replaced or swapped without module installation and configuration
SYNC update interrupted or installed only partly

Symptoms

  • Centre screen stays dark or keeps rebooting
  • No radio, phone or navigation functions
  • Rear camera picture or touch controls missing on the screen

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€60–900
Time0.5–2 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

accessory protocol interface modulecontrol module software

Related codes

U0253U0554U0300

References: static.nhtsa.gov, en.wikipedia.org.